| /* |
| * This is a reproducer copied from one of LKML patch submission, |
| * which subject is |
| * |
| * [PATCH] mlock: revert the optimization for dirtying pages and triggering writeback. |
| * |
| * "In 5ecfda0, we do some optimization in mlock, but it causes |
| * a very basic test case(attached below) of mlock to fail. So |
| * this patch revert it with some tiny modification so that it |
| * apply successfully with the lastest 38-rc2 kernel." |
| * |
| * Copyright (C) 2010 Red Hat, Inc. |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of version 2 of the GNU General Public |
| * License as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it would be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| * |
| * Further, this software is distributed without any warranty that it |
| * is free of the rightful claim of any third person regarding |
| * infringement or the like. Any license provided herein, whether |
| * implied or otherwise, applies only to this software file. Patent |
| * licenses, if any, provided herein do not apply to combinations of |
| * this program with other software, or any other product whatsoever. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| * 02110-1301, USA. |
| */ |
| #include "test.h" |
| #include "config.h" |
| |
| char *TCID = "mlock04"; |
| int TST_TOTAL = 1; |
| |
| #include <sys/mman.h> |
| #include <stdio.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <unistd.h> |
| #include <sys/types.h> |
| |
| int fd, file_len = 40960; |
| char *testfile = "test_mlock"; |
| |
| static void setup(void); |
| static void cleanup(void); |
| |
| int main(void) |
| { |
| char *buf; |
| int lc; |
| |
| setup(); |
| |
| for (lc = 0; TEST_LOOPING(lc); lc++) { |
| buf = mmap(NULL, file_len, PROT_WRITE, MAP_SHARED, fd, 0); |
| |
| if (buf == MAP_FAILED) |
| tst_brkm(TBROK | TERRNO, cleanup, "mmap"); |
| |
| if (mlock(buf, file_len) == -1) |
| tst_brkm(TBROK | TERRNO, cleanup, "mlock"); |
| |
| tst_resm(TINFO, "locked %d bytes from %p", file_len, buf); |
| |
| if (munlock(buf, file_len) == -1) |
| tst_brkm(TBROK | TERRNO, cleanup, "munlock"); |
| |
| if (munmap(buf, file_len) == -1) |
| tst_brkm(TBROK | TERRNO, cleanup, "munmap"); |
| } |
| |
| tst_resm(TPASS, "test succeeded."); |
| |
| cleanup(); |
| |
| tst_exit(); |
| } |
| |
| static void setup(void) |
| { |
| tst_tmpdir(); |
| |
| fd = open(testfile, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR); |
| if (fd == -1) |
| tst_brkm(TBROK | TERRNO, cleanup, "open"); |
| |
| if (ftruncate(fd, file_len) == -1) |
| tst_brkm(TBROK | TERRNO, cleanup, "ftruncate"); |
| |
| TEST_PAUSE; |
| } |
| |
| static void cleanup(void) |
| { |
| close(fd); |
| |
| tst_rmdir(); |
| } |